26 Aquarii
Star in the constellation Aquarius
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26 Aquarii is a single[6] star located approximately 960[1] light years away from the Sun in the zodiac constellation of Aquarius. 26 Aquarii is the Flamsteed designation.[5] It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 5.66.[2] This object is moving away from the Earth with a heliocentric radial velocity of +8 km/s.[2]
| Observation data Epoch J2000.0 Equinox ICRS | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 21h 42m 10.11292s[1] |
| Declination | +01° 17′ 06.9019″[1] |
| Apparent magnitude (V) | 5.66[2] |
| Characteristics | |
| Spectral type | K2(III)[3] |
| B−V color index | 1.446±0.008[2] |
| Astrometry | |
| Radial velocity (Rv) | +8.15±0.19[2] km/s |
| Proper motion (μ) | RA: −4.298[1] mas/yr Dec.: −7.530[1] mas/yr |
| Parallax (π) | 3.4044±0.1310 mas[1] |
| Distance | 960 ± 40 ly (290 ± 10 pc) |
| Absolute magnitude (MV) | −1.98[2] |
| Details | |
| Radius | 54.5+3.5 −3.00[1] R☉ |
| Luminosity | 842±38[1] L☉ |
| Surface gravity (log g) | 1.2[4] cgs |
| Temperature | 4,210+121 −129[1] K |
| Rotational velocity (v sin i) | 3.2[4] km/s |
| Other designations | |
| 26 Aqr, BD+00°4770, GC 30377, HD 206445, HIP 107144, HR 8287, SAO 126997[5] | |
| Database references | |
| SIMBAD | data |
Houk and Swift (1999) listed a stellar classification of K2(III)[3] for 26 Aquarii, corresponding to an evolved K-type giant of uncertain luminosity class. Bartkevicius and Lazauskaite (1997) found spectral traits of MD-Ba?-K3 II–III, K2 Ia, suggesting some type of giant K-type star with a suspected metal deficiency (MD) of barium.[7] It has 54.5 times the Sun's radius and is radiating 842 times the luminosity of the Sun from its photosphere at an effective temperature of 4,210 K.[1]